erc-8421

Post-quantum private payments on Ethereum: hash-based signatures and STARK proofs, a post-quantum mixnet, and an ERC-8421 privacy mempool on EIP-8141 frame transactions.

The permissionless gas payment layer for Ethereum. Pay gas in any ERC20: EIP-8141 frame-transaction paymaster priced and settled on Uniswap v4, admitted by the ERC-8421 alt mempool. SDK, MCP server, agent skill.

Shepherd: EIP-8141 frame-tx wallet for agents. Human keeps the owner key; the agent gets a scoped session key. VERIFY allowlists target, selector, and value in an external policy so the canonical mempool rejects and a staked alt-mempool admits. Anon-RPC on reads; CROPS notes in the README.